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Threat Intelligence Report

Unveiling Sirius Backdoor: A Multistage Fileless Campaign Disguised as FedEx Invoices

๐Ÿ“… October 28, 2026 ๐Ÿ“ฐ www.trellix.com ๐Ÿ” 0 CVE(s) referenced

A Korean FedEx invoice lure deploys the newly uncovered Sirius Backdoor through a multistage fileless chain that blinds EDR, hijacks trusted Windows processes, establishes resilient persistence, and enables extensive surveillance, credential theft, and covert remote control.

unclassified

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